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v2007.09.13 - Convex Optimization

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v2007.09.13 - Convex Optimization

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392 CHAPTER 6. EDM CONE(b)(c)dvec rel∂EDM 3(a)∂H0Figure 95: (a) In isometrically isomorphic subspace R 3 , intersection ofEDM 3 with hyperplane ∂H representing one fixed symmetric entry d 23 =κ(both drawn truncated, rounded vertex is artifact of plot). EDMs in thisdimension corresponding to affine dimension 1 comprise relative boundary ofEDM cone (6.6). Since intersection illustrated includes a nontrivial subsetof cone’s relative boundary, then it is apparent there exist infinitely manyEDM completions corresponding to affine dimension 1. In this dimension it isimpossible to represent a unique nonzero completion corresponding to affinedimension 1, for example, using a single hyperplane because any hyperplanesupporting relative boundary at a particular point Γ contains an entire ray{ζΓ | ζ ≥0} belonging to rel∂EDM 3 by Lemma 2.8.0.0.1. (b) d 13 =κ.(c) d 12 =κ.

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